Method and device for providing instruction of physical resource used for random access, and storage medium

ABSTRACT

Disclosed is a method and device for indicating a random access physical resource, which may include: semi-statically configuring an internal structure of a random access slot through a broadcast channel. A computer-readable storage medium is further provided in the present disclosure.

CROSS-REFERENCES TO RELATED APPLICATIONS

This disclosure claims priority to a Chinese patent application No.201710189324.8 filed on Mar. 27, 2017, disclosure of which isincorporated herein by reference in its entirety.

TECHNICAL FIELD

The present invention relates to the field of wireless communications,and specifically relates to a method and a device for indicating arandom access physical resource, and a storage medium thereof.

BACKGROUND

In the new generation mobile communications system, system networkingwill be performed on carrier frequencies higher than those used in 2G,3G, and 4G systems. Currently, the frequency bands widely recognized bythe industry and identified by international organizations are mainly 3GHz to 6 GHz, and 6 GHz to 100 GHz. With respect to networkingfrequencies of early communications systems, these frequency bands arerelatively high, have greater loss in propagation, and have a relativelysmaller coverage radius under the same power. This also determines thatthe beamforming technology needs to be adopted for increasing thecoverage radius in the networking of the new generation mobilecommunications system. The initial access has higher requirements forcoverage, and requires a coverage range greater than that required bythe service. The beamforming technology is even more essential.

For the new generation mobile communications system in which beamformingis widely used, one beam cannot completely cover an entire cell, and aplurality of beams are needed to cover the entire cell or a sector inthe traditional sense. If the plurality of beams cannot be transmittedat the same time, a process of beam scanning in the time dimension isrequired to cover the entire cell or sector. For downlink common signalsor channels such as synchronization signals, broadcast channels, commoncontrol channels, common traffic channels, etc., a seamless coverage ofthe entire cell needs to be ensured, and the beam is required to meetthe coverage requirement. When the plurality of beams cannot betransmitted at the same time, a complete process of beam scanning mustbe gone through so that the corresponding common signals or commoninformation can be read by terminals at all possible positions in thecell. After reading the random access configuration message carried bythe common signal or the common information, the terminal may initiaterandom access according to the random access physical resource notifiedin the random access configuration message. At this time, if the basestation needs to transmit a message to the terminal, which beam is apreferred beam that can successfully transmit information to theterminal is at least required to be known since a single beam cannotcover the entire cell. A technical solution is not provided in therelated art. If the base station randomly selects one beam or transmitsa message to a specific terminal in all beams, this causes a wrongselection of a beam by the base station so that the terminal fails toreceive the message, or a waste of beam resources because of a use ofall beams to transmit the message to a specific terminal.

SUMMARY

The present invention provides a method and a device for indicating arandom access physical resource, and a storage medium thereof, in hopeof at least partially solving the above-mentioned problem.

In a first aspect, the present disclosure provides a method forindicating a random access physical resource, including:

semi-statically configuring an internal structure of a random accessslot through a broadcast channel.

In a second aspect, the present disclosure provides a device forindicating a random access physical resource, including:

a first configuration module, which is configured to semi-staticallyconfigure an internal structure of a random access slot through abroadcast channel.

In a third aspect, the present disclosure provides a device forindicating a random access physical resource, including a processor anda memory, where the memory stores computer-executable instructionswhich, when executed by the processor, may implement any method forindicating a random access physical resource provided in the firstaspect.

In a fourth aspect, the present disclosure provides a method forindicating a random access physical resource, including:

receiving an internal structure of a random access slot semi-staticallyconfigured by a base station or a transmission-reception point(TRP)through a broadcast channel;

determining a random access slot in use according to an associationrelationship between a downlink synchronization signal block or areference signal from the base station or the transmission-receptionpoint and a first random access slot; and

transmitting a random access signal on the determined random access slotor on a part of the random access slot.

In a fifth aspect, the present disclosure provides a device forindicating a random access physical resource, including:

a second receiving module, which is configured to receive an internalstructure of a random access slot semi-statically configured by a basestation or a transmission-reception point(TRP) through a broadcastchannel;

a second determining module, which is configured to determine a randomaccess slot in use according to an association relationship between adownlink synchronization signal block or a reference signal from thebase station or the transmission-reception point and a first randomaccess slot; and

a second transmitting module, which is configured to transmit a randomaccess signal on the determined random access slot or on a part of therandom access slot.

In a sixth aspect, the present disclosure provides a device forindicating a random access physical resource, including a processor anda memory, where the memory stores computer-executable instructionswhich, when executed by the processor, implement any method forindicating a random access physical resource provided in the fourthaspect.

In a seventh aspect, the present disclosure further provides acomputer-readable storage medium which stores computer-executableinstructions; and after executed, the computer-executable instructionscan implement any of the method for indicating a random access physicalresource provided in the first aspect or the fourth aspect.

For the method and device for indicating a random access physicalresource and the storage medium thereof in the present invention, thebase station configures the internal structure of the random access slotthrough the broadcast channel. If the internal structure of such arandom access slot is known by the terminal (e.g., user equipment (UE))in advance, the UE may transmit a random access request in acorresponding random access slot once a beam is detected by the UEitself, such that after the random access request is received by thebase station, the base station knows which beam is detected by theterminal, and then successfully transmits information to the terminal byusing the beam. For example, the association relationship between thedownlink synchronization signal block or the reference signal and thefirst random access slot is notified through a system message accordingto the internal structure of the random access slot. Since the downlinksynchronization signal block or the reference signal is transmitted bythe beam, if the terminal detects a certain synchronization signal blockor reference signal or detects the synchronization signal block or thereference signal with the best received signal quality, the first randomaccess physical resource is determined according to the associationrelationship, and a random access request is transmitted on the firstrandom access physical resource, the base station may determine whichbeam may be detected by the terminal or that the beam with the highestreceived signal strength is detected by the terminal according to therandom access physical resource where the random access requesttransmitted currently by the terminal is located. If the beam determinedby this method is used to transmit information to the terminal, theinformation has a higher probability of being successfully received bythe terminal. Obviously the problem that which beam transmits theinformation to the specific terminal cannot be determined by theterminal in the related art is solved. At the same time, by adopting abeam determined in such a manner to transmit information, theprobability that the terminal successfully receives the informationtransmitted by the base station may be improved.

BRIEF DESCRIPTION OF DRAWINGS

The drawings are used to provide a further understanding of thetechnical solutions of the present invention, constitute a part of thespecification, explain the technical solutions of the present inventionin conjunction with the embodiments and examples of the presentdisclosure, and do not limit the technical solutions of the presentinvention.

FIG. 1 is a flowchart of a method for indicating a random accessphysical resource according to an embodiment 1 of the present invention;

FIG. 2 is a structural diagram of a device for indicating a randomaccess physical resource according to the embodiment 1 of the presentinvention;

FIG. 3 is a flowchart of a method for indicating a random accessphysical resource according to an embodiment 2 of the present invention;

FIG. 4 is a structural diagram of a device for indicating a randomaccess physical resource according to the embodiment 2 of the presentinvention;

FIG. 5 is a diagram illustrating a corresponding relationship between asynchronization signal block and a random access physical resourcesubset according to an embodiment of the present invention;

FIG. 6 is a diagram illustrating a synchronization signal burst setaccording to an embodiment of the present invention;

FIG. 7 is a diagram showing a slot according to an embodiment of thepresent invention;

FIG. 8 is a schematic diagram showing a mapping relationship between adownlink synchronization signal block or reference signal, an occasionand a random access channel (RACH) slot according to an example 1 of anembodiment of the present invention;

FIG. 9 is a schematic diagram showing another mapping relationshipbetween a downlink synchronization signal block or reference signal, anoccasion and a RACH slot according to the example 1 of the embodiment ofthe present invention;

FIG. 10 is a schematic diagram showing another mapping relationshipbetween a downlink synchronization signal block or reference signal, anoccasion and a RACH slot according to the example 1 of the embodiment ofthe present invention;

FIG. 11 is a schematic diagram showing a mapping relationship between adownlink synchronization signal block or reference signal, an occasionand a RACH slot according to an example 2 of an embodiment of thepresent invention; and

FIG. 12 is a schematic diagram showing another mapping relationshipbetween a downlink synchronization signal block or reference signal, anoccasion and a RACH slot according to the example 2 of the embodiment ofthe present invention.

DETAILED DESCRIPTION

Objects, technical solutions and advantages of the present inventionwill be clearer from a detailed description of embodiments of thepresent invention in conjunction with the drawings. It should be notedthat if not in collision, the embodiments and features therein in thepresent disclosure may be combined with each other.

The steps illustrated in the flowcharts of the drawings may be executedby, for example, a set of computer-executable instructions in a computersystem. Moreover, although the flowcharts illustrate a logical order ofexecution, the steps illustrated or described may, in some cases, beexecuted in an order different from that herein.

A study found that random access physical resources are common resourcesfor all beams, and no subset of random access physical resources isspecifically configured for a certain beam. The advantage is that therandom access physical resources are a large resource pool for allbeams, the resource selection range is larger, and the collisionprobability of random access can be reduced when the access density isnot high, while the disadvantage is also obvious. No resource subset fora specific beam direction exists, and it is difficult for the basestation to determine the downlink beam preferred by the terminal throughthe resource selected by the terminal. Therefore, in the embodiments,the base station will notify to configure an internal structure of therandom access resource, and after the internal structure is known by theterminal, the terminal selects a random access resource and transmits arandom access request according to the internal structure and the beamdetected by the terminal itself. For example, the terminal will obtainthe association relationship between a downlink synchronization signalblock or a reference signal and the first random access slot, and thedownlink synchronization signal block or the reference signal has acorresponding relationship with a specific beam. Thus, if the terminalchooses to initiate random access on the first random access slot, thebeam that may be successfully detected by the terminal may be easilydetermined by the terminal, so that which beam is used to transmit theinformation to the terminal is determined. Thereby, the success rate oftransmitting information to the terminal is improved.

EMBODIMENT 1

As shown in FIG. 1, a method for indicating a random access physicalresource is provided and may include the steps described below.

In a step 101, an internal structure of a random access slot issemi-statically configured through a broadcast channel.

In a step 102, a terminal is notified of an association relationshipbetween a downlink synchronization signal block or a reference signaland a first random access slot through a system message.

The step 101 may include: determining the internal structure of therandom access slot, and semi-statically broadcasting the internalstructure of the random access slot through the broadcast channel. Inthis way, the internal structure of the random access slot configured bya base station may be received by the terminal on the broadcast channel.The base station semi-statically broadcasts the internal structure ofthe random access slot, that is, in a semi-static period correspondingto every other semi-static period, the base station broadcasts theinternal structure of the random access slot once through the broadcastchannel.

The step 102 may include: determining an association relationshipbetween the downlink synchronization signal block and the first randomaccess slot, and/or determining an association relationship between thereference signal and the first random access slot according to theinternal structure of the random access slot, and notifying the terminalof the determined association relationship through the system message.

In practical application, a plurality of random access slots may beinvolved in the association relationship between the downlinksynchronization signal block or the reference signal and the randomaccess slot, and N random access slots may be provided (as describedbelow). The first random access slot in the embodiment represents thefirst slot of the plurality of random access slots, and the randomaccess slots may be fully expressed by the starting point plus thenumber. Optionally, the number N may be separately notified, and thefirst random access slot may also be separately notified.

In an implementation mode, the internal structure of the random accessslot may at least include one of:

a ratio of a downlink part to an uplink part in the random access slot;

the number of symbols occupied by random access of the uplink part inthe random access slot;

a time length of a random access physical resource of the uplink part inthe random access slot; and

the number of random access channel (RACH) occasions for the uplink partin the random access slot.

In an implementation mode, the internal structure of the random accessslot is a slot in which the downlink part is dominant or a slot in whichthe uplink part is dominant.

In an implementation mode, the internal structure of the random accessslot is configured according to a random access preamble format. Forexample, the internal structure of the random access slot is configuredaccording to a random access preamble format that needs to be supported.

In an implementation mode, in the time domain, the associationrelationship between the downlink synchronization signal block or thereference signal and the first random access slot may be that: the k-thrandom access slot after the downlink synchronization signal block orthe reference signal is the first random access slot, where k is apositive integer.

In another implementation mode, in the time domain, the associationrelationship between the downlink synchronization signal block or thereference signal and the first random access slot may be: theassociation relationship between the downlink synchronization signalblock or the reference signal and the first random access slot isrelated to an index of the downlink synchronization signal block or thereference signal in the time domain. For example, the random access slotmay select the same index of the downlink synchronization signal blockor the reference signal, or the random access slot may be obtained byperforming function calculation on the index of the downlinksynchronization signal block or the reference signal. Here, the indexmay be an index number.

In an implementation mode, the method further includes: determining anassociation relationship between the synchronization signal block or thereference signal and N random access slots, and notifying the terminalin an explicit or implicit manner, where N is an integer greater than orequal to 1 or a fraction greater than 0 and less than 1. In practicalapplication, no clear sequence exists for the determination andnotification of the association relationship between the synchronizationsignal block or the reference signal and N random access slots to theterminal practical application and the notification of the associationrelationship between the synchronization signal block or the referencesignal and the first random access slot in the embodiment. Here, if theterminal is notified in the explicit manner, the notification isimplemented through a clear information indication. If the terminal isnotified in the implicit manner, the method may include: a correspondingrelationship between a certain message or signal and an associationrelationship is established in advance, and then the message or signalis transmitted. The association relationship is not explicitlyindicated, but the terminal may determine the indicated associationrelationship according to the above-mentioned correspondingrelationship.

In an implementation mode, the number N may be determined by at leastone of the following configurations or any combination thereof:

random access channel preamble format;

random access slot configuration; and

a length of a random access signal.

In an implementation mode, the step in which the internal structure ofthe random access slot is semi-statically configured through thebroadcast channel includes one of the steps described below.

The association relationship between every synchronization signal blockor reference signal in the synchronization signal burst set and therespective corresponding first random access slot is the same.

Each of the synchronization signal blocks or reference signals in thesynchronization signal burst set has an association relationshiprespectively configured.

In an implementation mode, each of the random access slots provides oneor more frequency domain resources as random access time-frequencyresources.

The above-mentioned method of the embodiment may be implemented througha base station, a transmission-reception point (TRP), or other similardevices. As shown in FIG. 2, a device for indicating a random accessphysical resource is provided and includes a first configuration module21 and a first notification module 22.

The first configuration module 21 is configured to semi-staticallyconfigure an internal structure of a random access slot through abroadcast channel.

The first notification module 22 is configured to notify a terminal ofan association relationship between a downlink synchronization signalblock or a reference signal and a first random access slot through asystem message. For example, the first notification module 22 may beconfigured to notify the terminal of an association relationship betweenthe downlink synchronization signal block or the reference signal andthe first random access slot through the system message according to aninternal structure of a random access slot.

In an implementation mode, the internal structure of the random accessslot at least includes one of:

a ratio of a downlink part to an uplink part in the random access slot;

the number of symbols occupied by random access of the uplink part inthe random access slot; and

a time length of a random access physical resource of the uplink part inthe random access slot.

In an implementation mode, the internal structure of the random accessslot is a slot in which the downlink part is dominant or a slot in whichthe uplink part is dominant.

In an implementation mode, the first configuration module 21 may beconfigured to set the internal structure of the random access slotaccording to a random access preamble format that needs to be supported.

In an implementation mode, the first configuration module 21 may furtherbe configured to determine the association relationship between thedownlink synchronization signal block or the reference signal and thefirst random access slot in the time domain as that: the k-th randomaccess slot after the downlink synchronization signal block or thereference signal is the first random access slot, where k is a positiveinteger.

In an implementation mode, the first configuration module 21 may furtherbe configured to determine an association between the downlinksynchronization signal block or the reference signal and N random accessslots; and the first notification module 22 may be further configured tonotify the terminal of the association between the downlinksynchronization signal block or the reference signal and N random accessslots in an explicit or implicit manner, where N is an integer greaterthan or equal to 1 or a fraction greater than 0 and less than 1.

In an implementation mode, the number N is determined by at least one ofthe following configurations or any combination thereof:

random access channel preamble format;

random access slot configuration; and

a length of a random access signal.

In an implementation mode, the step in which the first configurationmodule 21 may be configured to semi-statically configure the internalstructure of the random access slot through the broadcast channelincludes one of the steps described below.

The association relationship between every synchronization signal blockor reference signal in the synchronization burst set and the respectivecorresponding first random access slot is the same.

Each of the synchronization signal blocks or reference signals in thesynchronization burst set has an association relationship respectivelyconfigured.

In an implementation mode, the first configuration module 21 is furtherconfigured to configure each of the random access slots for providingone or more frequency domain resources as random access time-frequencyresources.

In an implementation mode, the first configuration module 21 is furtherconfigured to determine the association relationship between thedownlink synchronization signal block or the reference signal and thefirst random access slot in the time domain as that: the associationrelationship between the downlink synchronization signal block or thereference signal and the first random access slot is related to an indexof the downlink synchronization signal block or the reference signal inthe time domain.

Another device for indicating a random access physical resource includesa processor and a memory. The memory is configured to storecomputer-executable instructions which, when executed by the processor,implement the method described below.

An internal structure of a random access slot is semi-staticallyconfigured through a broadcast channel.

A terminal is notified of an association relationship between a downlinksynchronization signal block or a reference signal and a first randomaccess slot through a system message.

The device for indicating a random access physical resource in theembodiment may implement all details of the method in the embodiment.The description related to the method may be referred to. In practicalapplication, the device for indicating a random access physical resourcein the embodiment may implement the above-mentioned functions and themethod of the embodiment by being configured on a base station, atransmission-reception point or other similar devices, or the device forindicating a random access physical resource in the embodiment maydirectly be the base station, the transmission-reception point or othersimilar devices. In practical application, the first configurationmodule 21 and the first notification module 22 may respectively beimplemented by software, hardware, or a combination thereof. Forexample, the first configuration module 21 may be implemented by thebase station, the transmission-reception point or other similar devices,and the first notification module 22 may be implemented by acommunications unit of the base station, the transmission-receptionpoint or other similar devices. For another example, the firstconfiguration module 21 may be implemented by a processor of the basestation, the transmission-reception point or another similar device, andthe first notification module 22 may be implemented by a combination ofa communications unit and the processor of the base station, thetransmission-reception point or other similar devices. No limitationthereto is made herein.

EMBODIMENT 2

As shown in FIG. 3, a method for indicating a random access physicalresource is provided and may include the steps described below.

In a step 301, an internal structure of a random access slotsemi-statically configured by a base station or a transmission-receptionpoint (TRP) through a broadcast channel is received. The internalstructure of the random access slot may be used for determining the typeof an association relationship between a downlink synchronization signalblock or a reference signal and a first random access slot, such as, anassociation relationship between the downlink synchronization signalblock and the first random access slot which may be the same as or bedifferent from an association relationship between the reference signaland the first random access slot.

In a step 302, a random access slot in use is determined according to anassociation relationship between a downlink synchronization signal blockor a reference signal from the base station or thetransmission-reception point and the first random access slot. In thestep 302, the random access slot in use is determined according to theconfigured internal structure of the random access slot.

In a step 303, a random access signal is transmitted on the determinedrandom access slot or on a part of the random access slot.

In practical application, a plurality of random access slots may beinvolved in the association relationship between the downlinksynchronization signal block or the reference signal and the randomaccess slot, and N random access slots may be provided (as described inEmbodiment 1). The first random access slot in the embodiment representsthe first slot of the plurality of random access slots, and the randomaccess slots may be fully expressed by the starting point plus thenumber. Optionally, the number N may be separately notified, and thefirst random access slot may also be separately notified.

In an implementation mode, the internal structure of the random accessslot at least includes one of:

a ratio of a downlink part to an uplink part in the random access slot;

the number of symbols occupied by random access of the uplink part inthe random access slot; and

a time length of a random access physical resource of the uplink part inthe random access slot; and

the number of RACH occasions for the uplink part in the random accessslot.

In an implementation mode, the internal structure of the random accessslot may satisfy one of the conditions described below.

The downlink part is dominant in the random access slot.

The uplink part is dominant in the random access slot.

In an implementation mode, in the time domain, the associationrelationship between the downlink synchronization signal block and thefirst random access slot is that: the k-th random access slot after thedownlink synchronization signal block or the reference signal is thefirst random access slot, where k is a positive integer. At this time,the step in which the random access signal is transmitted on thedetermined random access slot or on a part of the random access slot mayinclude: transmitting the random access signal by taking the firstrandom access slot or randomly selecting any random access slot afterthe first random access slot as the starting position.

In an implementation mode, the step in which the random access signal istransmitted on the determined random access slot or on a part of therandom access slot may include: selecting N random access slots totransmit the random access signal, where N is an integer greater than orequal to 1 or a fraction greater than 0 and less than 1.

In an implementation mode, the number N is determined by at least one ofthe following configurations or any combination thereof:

random access channel preamble format;

random access slot configuration; and

a length of a random access signal.

In an implementation mode, the step in which the random access signal istransmitted on the determined random access slot or on a part of therandom access slot may include that the starting position of the randomaccess signal in the random access slot is determined by the indexnumber of the downlink synchronization signal block or the referencesignal and the number N.

In an implementation mode, the method may further include: selecting oneor more frequency domain resources as random access time-frequencyresources in each of the random access slots, so that the random accesssignal is transmitted on the random access time-frequency resources.

In an implementation mode, the step in which the random access signal istransmitted on the determined random access slot or on a part of therandom access slot may include: determining a frequency domain resourceor a frequency domain position in a manner of frequency domainrandomization when the random access signal is transmitted.

In an implementation mode, the association relationship between thedownlink synchronization signal block or the reference signal and thefirst random access slot is related to an index of the downlinksynchronization signal block or the reference signal in the time domain.At this time, the step in which the random access signal is transmittedon the determined random access slot or on a part of the random accessslot may include: transmitting the random access signal by taking thefirst random access slot or randomly selecting any random access slotafter the first random access slot as the starting position.

The above-mentioned method of the embodiment may be implemented througha terminal or other similar devices.

As shown in FIG. 4, a device for indicating a random access physicalresource is provided and may include a second receiving module 41, asecond determining module 42 and a second transmitting module 43.

The second receiving module 41 is configured to receive an internalstructure of a random access slot semi-statically configured by a basestation or a transmission-reception point (TRP) through a broadcastchannel.

The second determining module 42 is configured to determine a randomaccess slot in use according to an association relationship between adownlink synchronization signal block or a reference signal from thebase station or the transmission-reception point and a first randomaccess slot.

The second transmitting module 43 is configured to transmit a randomaccess signal on the determined random access slot or on a part of therandom access slot.

In an implementation mode, the internal structure of the random accessslot at least includes one of:

a ratio of a downlink part to an uplink part in the random access slot;

the number of symbols occupied by random access in the random accessslot;

a time length of a random access physical resource in the random accessslot; and

the number of RACH occasions for the uplink part in the random accessslot.

In an implementation mode, the internal structure of the random accessslot satisfies one of the conditions described below.

The downlink part is dominant in the random access slot.

The uplink part is dominant in the random access slot.

In an implementation mode, in the time domain, the associationrelationship between the downlink synchronization signal block or thereference signal and the first random access slot may be that: the k-thrandom access slot after the downlink synchronization signal block orthe reference signal is the first random access slot, where k is apositive integer. At this time, the second transmitting module 43 may bespecifically used for transmitting the random access signal by takingthe first random access slot or randomly selecting any random accessslot after the first random access slot as the starting position.

In an implementation mode, the second transmitting module 43 may beconfigured to select N random access slots to transmit the random accesssignal. N is an integer greater than or equal to 1 or a fraction greaterthan 0 and less than 1. In an implementation mode, the number N isdetermined by at least one of the following configurations or anycombination thereof: random access channel preamble format; randomaccess slot configuration; and a length of a random access signal.

In an implementation mode, the second transmitting module 43 may furtherbe configured to determine a starting position of the random accesssignal in the random access slot through the index number of thedownlink synchronization signal block or the reference signal and thenumber N.

In an implementation mode, the second determining module 42 may furtherbe configured to select one or more frequency domain resources as randomaccess time-frequency resources in each of the random access slots, sothat the random access signal is transmitted on the random accesstime-frequency resources.

In an implementation mode, the second transmitting module 43 may furtherbe configured to determine a frequency domain resource or a frequencydomain position in a manner of frequency domain randomization when therandom access signal is transmitted.

In an implementation mode, the association relationship between thedownlink synchronization signal block or the reference signal and thefirst random access slot is related to an index of the downlinksynchronization signal block or the reference signal in the time domain.At this time, the second transmitting module 43 may be specifically usedfor transmitting the random access signal by taking the first randomaccess slot or randomly selecting any random access slot after the firstrandom access slot as the starting position.

Another device for indicating a random access physical resource includesa processor and a memory. The memory is configured to storecomputer-executable instructions which, when executed by the processor,implement the method described below.

An internal structure of a random access slot semi-statically configuredby a base station or a transmission-reception point (TRP) through abroadcast channel is received.

A random access slot in use is determined according to an associationrelationship between a downlink synchronization signal block or areference signal from the base station or the transmission-receptionpoint and a first random access slot.

A random access signal is transmitted on the determined random accessslot or on a part of the random access slot.

The device for indicating a random access physical resource in theembodiment may implement all details of the method in the embodiment.The description related to the method may be referred to. In practicalapplication, the device for indicating a random access physical resourcein the embodiment may implement the above-mentioned functions and themethod of the embodiment by being configured on a terminal or othersimilar devices, or the device for indicating a random access physicalresource in the embodiment may directly be the terminal or other similardevices.

In practical application, the second receiving module 41, the seconddetermining module 42, and the second transmitting module 43 mayrespectively be implemented by software, hardware, or a combinationthereof. For example, the second determining module 42 may beimplemented by the terminal or other similar devices. The secondreceiving module 41 and the second transmitting module 43 may beimplemented by a communications unit of the terminal or other similardevices. For another example, the second determining module 42 may beimplemented by a processor of the terminal or other similar devices. Thesecond receiving module 41 and the second transmitting module 43 may beimplemented by a combination of a communications unit and the processorof the terminal or another similar device. No limitation thereto is madeherein.

EMBODIMENT 3

An embodiment provides a method for indicating a random access physicalresource. The process is described below.

An internal structure of a random access slot is semi-staticallyconfigured by a base station or a TRP through a broadcast channel.

A terminal receives the internal structure of the random access slotsemi-statically configured by the base station or the TRP through thebroadcast channel.

The base station or the TRP notifies the terminal of an associationrelationship between a downlink synchronization signal block or areference signal and a first random access slot through a systemmessage.

The terminal determines a random access slot according to the quality ofthe received downlink signal or channel and the association relationshipbetween the downlink synchronization signal block or the referencesignal and the first random access slot.

The terminal transmits a random access signal on the determined randomaccess slot or on a part of the random access slot.

For the specific implementation process of the embodiment, reference maybe made to Embodiment 1 and Embodiment 2. Reference may be made toEmbodiment 1 and Embodiment 2 described above.

To solve the problem of how the base station obtains the information ofthe downlink transmission beam selected by the terminal, it is necessaryto consider establishing an association relationship between the initialdownlink signal or channel received by the terminal and the randomaccess physical resource. These common signals may be various types ofsynchronization signals. The common channel may be a broadcast channel,a channel carrying common control information, a channel carrying acommon traffic, or the like.

The simplest corresponding relationship is to establish a correspondingrelationship of a one-to-one mapping between the downlink signal orchannel and a subset of a random access physical resource pool. As shownin FIG. 5, for example, a certain block of resource carrying theabove-mentioned common signal or channel is referred to as asynchronization signal block (SS block). The SS block is merely apossible name, and does not limit the functional features of the carriedcorresponding downlink signal or channel. Each SS block corresponds toat least one downlink signal or channel in a specific beam direction orfrom an antenna port. The SS block has a one-to-one correspondingrelationship with a random access physical resource subset. For example,as shown in FIG. 5, a one-to-one correspondence exists between adownlink SS block 1 or a reference signal 1 and a RACH resource 1, aone-to-one correspondence exists between a downlink SS block 2 or areference signal 2 and a RACH resource 2, a one-to-one correspondenceexists between a downlink SS block 3 or a reference signal 3 and a RACHresource 3, and a one-to-one correspondence exists between a downlink SSblock 4 or a reference signal 4 and a RACH resource 4.

Here, the one-to-one correspondence is a relatively simple correspondingrelationship. The terminal needs to obtain such correspondingrelationship for obtaining corresponding random access physicalresources, and then determine the corresponding random access physicalresource according to the selected downlink signal or channel.

Optionally, the SS block of the base station is the minimum unitcarrying the synchronization signal, and carries a synchronizationsignal in a beam direction or from an antenna port. A plurality of SSblocks are combined into a synchronization signal burst (SS burst) inthe time domain, and a plurality of SS bursts are combined into asynchronization signal burst set (SS burst set) in the time domain. OneSS burst set includes synchronization signals in all beam directions orfrom antenna ports, and the synchronization signals are repeatedlytransmitted in a period of a SS burst set. An example of a SS burst setis shown in FIG. 6.

A random access channel (RACH) occasion is defined as a time-frequencyresource used by a random access signal transmitted in a configuredrandom access preamble format. The terminal receives the downlink signalor channel and detects the quality thereof to obtain qualityinformation. For example, the strength of the received signal of the SSblock is detected, a suitable SS block is selected according to thestrength of the received signal, and the time-frequency resource used bythe random access channel (RACH) occasion is determined by combining thecorresponding relationship between the downlink signal or channel andthe subset of the random access physical resource pool. The base stationmay indirectly know the SS block preferred by the terminal by receivingthe random access signal.

The random access signal transmitted within the RACH occasioncorresponds to all possible beam directions received in the uplink or toreceive antenna ports. All receiving beam directions or receivingantenna ports are needed by the base station for detecting random accesssignals. In a scenario where the base station does not have the beamreciprocity, the terminal needs to repeatedly transmit the random accesssignal to ensure that the base station may obtain the preferred downlinktransmit beam and the preferred uplink receive beam respectively bydetecting the random access signal. In the scenario where the basestation has beam reciprocity, the terminal may not need to repeatedlytransmit the random access signal.

When the corresponding relationship between the downlink signal orchannel and the subset of the random access physical resource pool isdescribed, the representation of the resource occupied by the RACHoccasion of the random access physical resource pool is a logicalresource, and the logical resource ultimately needs to be embodied onthe physical resource. Here, the physical resource for transmitting therandom access signal is defined as a random access slot. In the newgeneration mobile communications system, a slot may be divided into adownlink slot and an uplink slot. The downlink slot or the uplink slotis not a simple downlink signal and a downlink channel or an uplinksignal and an uplink channel, but refers to that the downlink signal andthe downlink channel have a higher ratio in the downlink slot or theuplink signal and the uplink channel have a higher ratio in the uplinkslot.

An example of a slot including an uplink slot and a downlink slot isshown in FIG. 7. In the example shown in FIG. 7, the downlink slot is ina time division duplex (TDD) mode, and has 14 symbols, where thedownlink control channel (DLC) and the synchronization signal block(SSB) occupy 10 symbols with a ratio of more than 50%, while the uplinksignal RACH and the physical uplink control channel (PUCCH) occupy twosymbols. In the example shown in FIG. 7, the uplink slot is in the TDDmode, and has 14 symbols, where the downlink control channel (DLC)occupies 2 symbols, and the uplink signal RACH and the PUCCH occupy 10symbols with a ratio more than 50%.

Both the downlink slot and the uplink slot may be used to carry theuplink RACH signal, and the slot used to carry the random access signalis called a random access slot. The internal structures of the downlinkslot and the uplink slot are not limited to the example of FIG. 7.Various configuration possibilities exist. That is, when the internalstructure of the slot is dynamically adjusted, the interval sizes ofdifferent slots used to transmit the random access signal changedynamically. The granularity of the time change is at least one slot.When the change is the fastest, the number of resources provided by eachdifferent random access slot may be different. When the terminalsearches for a physical resource for transmitting the RACH according tothe association relationship between the downlink channel or thedownlink channel (typically a SSB) and a certain subset of the randomaccess physical resource pool (typically a RACH occasion), the downlinkcontrol information (DCI) in the downlink control channel in the slotneeds to be read to obtain the RACH physical resource, so as to obtainthe allocation of the RACH resources in the internal structure of theslot. Then the specific physical resource position is obtained throughindirect calculation. If the DCI information is always read, it is verydisadvantageous for reducing the power consumption of the terminal.Moreover, due to the dynamic change of the RACH resources in the randomaccess slot, it is difficult to generally determine whether the randomaccess physical resources in a SS burst set period are sufficient.

Before the type of the random access slot is reconfigured, the internalstructure of the random access slot should remain unchanged. That is,the ratio of the internal downlink and uplink, the number of symbolsoccupied by random access, and the time length of the random accessphysical resource should remain unchanged. In terms of long-termparameters in units of days and months, the internal structure of therandom access slot is preferably semi-static. Semi-static configurationmay be implemented through the broadcast message. Multiple options mayexist for a configuration set. The option may be a downlink slot, anuplink slot or the like. The configuration of the random access slotnotified in the broadcast message may be marked with the index of theinternal structure of the random access slot. The specific configurationis selected by the base station according to the random access preambleformat that needs to be supported by the slot. In special cases, asemi-static configuration may become a completely static curingconfiguration.

The base station further needs to determine all random access slotsavailable to the system. The density of the random access slot and theallocation position of the resource depend on various factors including:the random access preamble format to be adopted by the base station, thesize of the random access area provided for an uplink transmission inthe internal structure of the random access slot, whether the basestation can receive a plurality of different beams in the frequencydomain at the same time, whether the base station has the reciprocity ofbeam receiving and transmitting, and the like. The resources (sum oftime, frequency, and code resources) of the RACH occasion provided bythe random access slot in a SS burst set period need to meet at leastthe corresponding relationship with the downlink SS block or thereference signal.

From the perspective of the beam reciprocity of the base station, twoexamples are used below to respectively illustrate how to determine aphysical resource for transmitting the RACH, i.e., a random access slotwhen an association relationship exists between a downlink signal or adownlink channel (typically a downlink SS block or a reference signal)and a subset of the random access physical resource pool (typically aRACH occasion).

EXAMPLE 1

The example describes in detail the process of determining a physicalresource, i.e., a random access slot, for transmitting the RACH, in thescenario where the base station has no beam reciprocity.

FIG. 8 illustrates a mapping relationship between a downlink SS block ora reference signal, an occasion, and a RACH slot. Different SS blocks orreference signals correspond to different RACH occasions. An occasion isa logical resource number and needs to be mapped into a specificphysical RACH slot. FIG. 8 is a typical configuration, that is, one SSblock corresponds to one RACH occasion, and a logical resource of a RACHoccasion may right be carried by a random access physical slot. 8 RACHsymbols in the physical slot are taken as an example, indicating thatthe same random access symbol and sequence need to be repeated 8 times,so that the base station performs training and detection on 8 differentreceive beams. Here, a cyclic prefix (CP) of the random access signaland the guard period (GP) for differentiating slot downlink and uplinkmay share resources. A guard time (GT) of the random access signal andthe PUCCH may share resources.

FIG. 9 is a second typical configuration, that is, one downlink SS blockor reference signal corresponds to one RACH occasion, and a logicalresource of one RACH occasion may be carried by a plurality of, two inthe example, random access physical slots. A total of 16 RACH symbolsexist in two physical slots. The same random access symbol and sequenceneed to be repeated 16 times, so that the base station performs trainingand detection on 16 different receive beams. An uplink slot 1 and anuplink slot 2 may be continuously transmitted, or may be discontinuouslytransmitted. If a SS burst set period is long and contains more SSblocks, the corresponding RACH occasion is also longer, and more RACHphysical slots are mapped.

FIG. 10 is a third typical configuration, that is, one downlink SS blockor reference signal corresponds to one RACH occasion, and the logicalresource of a plurality of occasions may be carried by one random accessphysical slot. A total of 8 RACH symbols exist in one physical slot. Thesame random access symbol and sequence of a same RACH occasion need tobe repeated 4 times, so that the base station performs training anddetection on 4 different receive beams.

Obviously, the above three typical mapping relationships may coverone-to-one, one-to-many, and many-to-one mapping relationships betweenRACH occasions and random access physical resources under the conditionthat the base station does not have beam reciprocity. The base stationneeds to at least notify the terminal SS block of the mappingrelationship between the downlink SS block or the reference signal andthe initial RACH slot. For example, a rank number of a RACH slot, afterthe downlink SS block or the reference signal, where the initial accessmay be performed is notified. In particular, in the case of amany-to-one relationship between the RACH occasion and the random accessphysical resource, a rank number of a slot in which the initial accessmay be performed need be notified, and a specific starting position inthe slot need be determined. The specific starting position in the slotmay be directly notified and, in addition, may be indirectly determinedby the index number of the downlink SS block or the reference signal andthe number of random access signals that can be carried in one physicalslot.

The base station may further notify how many RACH slots may be mappedwith one downlink SS block or reference signal, that is, how many RACHslots may be used by the random access signal corresponding to thedownlink SS block or reference signal to transmit a random accesssignal. This number relationship is inversely related to the number ofrandom access signals that may be carried in one RACH slot. The numberof RACH slots here may not only be an integer greater than or equal to1, but may also be a fraction greater than 0 and less than 1, such as0.5, indicating that the random access signal may use only a half RACHslot, and such as 0.25, indicating that the random access signal mayoccupy only ¼ of the RACH slots. The number of RACH slots that may beused by the random access signal corresponding to the downlink SS blockor the reference signal may also be indirectly calculated through theconfigured physical random access channel format and the length of therandom access signal.

For all downlink SS blocks or reference signals in a SS burst set, theabove single mapping relationship may be applied to all downlink SSblocks or reference signals. Each downlink SS block or reference signalmay also be considered to have an independent mapping relationship. Theconfiguration of the independent mapping relationship requires moresignaling overhead. From the perspective of saving signaling overhead, asingle mapping relationship is more advantageous for all downlink SSblocks or reference signals in a unified configuration. If the RACHresources that need to be mapped with each downlink SS block orreference signal are not uniform, the RACH resources required for eachdownlink SS block or reference signal may be added in the frequencydomain or the code domain.

EXAMPLE 2

The example describes in detail the process of determining a physicalresource, i.e., a random access slot, for transmitting the RACH, in thescenario where the base station has beam reciprocity.

When the base station has beam reciprocity, which is different from thescenario where the base station has no beam reciprocity, the randomaccess symbol and sequence do not need to be repeated multiple times tomeet the needs of scanning by the receive beam of the base station,while it is not excluded that the sequence or symbol is repeated forenhancing coverage. As described above, the random access signaltransmitted within the RACH occasion corresponds to all possible beamdirections received in the uplink or to receive antenna ports. When thebeam has reciprocity, a representation form of the RACH occasion isdifferent from that under the condition of no reciprocity. FIG. 11illustrates a mapping relationship between a downlink SS block or areference signal, an occasion, and a RACH slot. Different downlink SSblocks or reference signals in a same SS burst set correspond to oneRACH occasion. An occasion is a logical resource number and needs to bemapped into a specific physical RACH slot. FIG. 11 is a typicalconfiguration, that is, one downlink SS block or reference signalcorresponds to a part of resources (corresponding to receive beams ofthe base station) of one RACH occasion, logical resources of one RACHoccasion are carried by a plurality of random access physical slots,while a certain downlink SS block or reference signal corresponds to oneof the plurality of random access physical slot.

FIG. 12 shows another possible typical configuration, that is, onedownlink SS block or reference signal corresponds to a part of resources(corresponding to receive beams of the base station) of one RACHoccasion, and logical resources of one RACH occasion are carried by aplurality of random access physical slots, while certain downlink SSblocks or reference signals correspond to one of the plurality of randomaccess physical slots. That is, one random access physical slot ismapped to a plurality of downlink SS blocks or reference signals.

One downlink SS block or reference signal corresponding to a pluralityof random access physical slots is also a possibility, similar to theconfiguration shown in FIG. 9 of Example 1, and will not be describedagain.

A certain commonality in the mapping relationship between the downlinkSS block or the reference signal and the random access slot existswhether the base station has beam reciprocity or not.

Similarly, the base station needs to at least notify the terminal of themapping relationship between the downlink SS block or the referencesignal and the initial RACH slot. For example, a rank number of a RACHslot, after the downlink SS block or the reference signal, where theinitial access may be performed is notified. In particular, in the caseof a many-to-one relationship between the downlink SS block or thereference signal and the random access physical resource, a rank numberof a slot in which the initial access may be performed need be notified,and a specific starting position in the slot need be determined. Thespecific starting position in the slot may be directly notified and, inaddition, may be indirectly determined by the index number of thedownlink SS block or the reference signal and the number of randomaccess signals that can be carried in one physical slot.

The base station may further notify the terminal of the mappingrelationship between the downlink SS block or the reference signal andthe initial RACH slot in other implementation modes. For example, theassociation relationship between the downlink SS block or the referencesignal and the initial RACH slot in the time domain is related to theindex of the downlink SS block or the reference signal. In short, if theindex of the downlink SS block or the reference signal is i, the RACHslot whose index is i or whose functional relationship is i is theassociated initial RACH slot.

The base station may further notify how many RACH slots may be mappedwith one downlink SS block or reference signal, that is, how many RACHslots may be used by the random access signal corresponding to thedownlink SS block or reference signal to transmit a random accesssignal. This number relationship is inversely related to the number ofrandom access signals that may be carried in one RACH slot. The numberof RACH slots here may not only be an integer greater than or equal to1, but may also be a fraction greater than 0 and less than 1, such as0.5, indicating that the random access signal may use only a half RACHslot, and such as 0.25, indicating that the random access signal mayoccupy only ¼ of the RACH slots. The number of RACH slots that may beused by the random access signal corresponding to the downlink SS blockor the reference signal may also be indirectly calculated through theconfigured physical random access channel format and the length of therandom access signal.

For all downlink SS blocks or reference signals in a SS burst set, theabove single mapping relationship may be applied to all downlink SSblocks or reference signals. Each downlink SS block or reference signalmay also be considered to have an independent mapping relationship. Moresignaling overhead is needed for a configuration of independent mappingrelationships (for example, the mapping relationship of a SS block 0 isk=4, the mapping relationship of a SS block 1 is k=3, and the mappingrelationship of a SS block 2 is k=6, where k is not a uniform value).From the perspective of saving signaling overhead, a single mappingrelationship is more advantageous for all downlink SS blocks orreference signals in a unified configuration. If the RACH resources thatneed to be mapped with each downlink SS block or reference signal arenot uniform, the RACH resources required for each downlink SS block orreference signal may be added in the frequency domain or the codedomain.

The above notification and indication methods apply not only to a singleterminal user, but also to a multi-user scenario. If multiple usersprefer the same downlink SS block or reference signal and initiaterandom access, interference with each other is avoided for the multipleusers in a manner of frequency domain or code domain randomization. Thefrequency domain randomization is preferred, and the position of thefrequency domain is determined by the terminal itself.

In addition, the present disclosure further provides a computer-readablestorage medium storing computer-executable instructions which, whenexecuted, implement any one of the above-mentioned methods forindicating a random access physical resource, such as implementing themethod illustrated in FIG. 1 and/or FIG. 3.

Optionally, in the embodiment, the storage medium may include, but isnot limited to, a USB flash drive, a read-only memory (ROM), a randomaccess memory (RAM), a mobile hard disk, a magnetic disk, an opticaldisk or another medium capable of storing program codes.

Optionally, the storage medium is a non-transitory storage medium.

Optionally, in the embodiment, a processor executes the steps in themethods described in the above embodiments according to the programcodes stored in the storage medium.

Optionally, for specific examples in the embodiment, reference may bemade to the examples described in the above embodiments and optionalimplementation modes, and repetition will not be made in the embodiment.

It should be understood by those skilled in the art that all or somesteps in the methods described above may be implemented by relevanthardware (such as a processor) as instructed by programs, and theprograms may be stored in a computer-readable storage medium, such as aread-only memory, a magnetic disk, an optical disk or the like.Optionally, all or some steps in the embodiments described above mayalso be implemented by using one or more integrated circuits.Accordingly, the various modules/units in the embodiments describedabove may be implemented by hardware. For example, the functions ofthese modules/units may be implemented by one or more integratedcircuits. These modules/units may also be implemented in the form ofsoftware function modules. For example, the functions of thesemodules/units may be implemented by using a processor to executeprograms/instructions stored in a memory. Embodiments of the presentdisclosure are not limited to any specific combination of hardware andsoftware.

The above illustrate and describe the basic principles, main featuresand advantages of the present disclosure. The present disclosure is notlimited to the above embodiments. The above embodiments andspecification describe only the principles of the present disclosure.Various modifications and improvements may be made in the presentdisclosure without departing from the spirit and scope of the presentdisclosure. These modifications and improvements are within the scope ofthe present disclosure.

INDUSTRIAL APPLICABILITY

In the present disclosure, the base station will configure an internalstructure of the random access slot, and notify the terminal of theassociation relationship between the downlink SS block or the referencesignal and the first random access slot through the system messageaccording to the internal structure of the random access slot. Thus,after the corresponding downlink SS block or the reference signal issuccessfully detected by the terminal, the terminal initiates a randomaccess request on the first random access slot according to theassociation relationship, and then the base station may know which beammay be used to successfully transmit information to the terminal. Theproblem that which beam used to transmit the information to the terminalcannot be determined is solved, and the success rate of transmittinginformation to the terminal by the base station is improved at the sametime, which has positive industrial effect and characterizes simpleimplementation and good application prospects.

1. A method, comprising: configuring an internal structure of a randomaccess slot through a broadcast channel, wherein the internal structureof the random access slot comprises a number of symbols occupied byrandom access of an uplink part in the random access slot, and a numberof random access channel (RACH) occasions for the uplink part in therandom access slot; and transmitting, through the broadcast channel, theinternal structure of the random access slot.
 2. The method of claim 1,wherein the internal structure of the random access slot is configuredaccording to a random access preamble format.
 3. (canceled)
 4. A device,comprising: a processor configured to: configure an internal structureof a random access slot through a broadcast channel, wherein theinternal structure of the random access slot comprises a number ofsymbols occupied by random access of an uplink part in the random accessslot, and a number of random access channel (RACH) occasions for theuplink part in the random access slot; and transmit, through thebroadcast channel, the internal structure of the random access slot. 5.The device of claim 4, wherein the internal structure of the randomaccess slot is configured according to a random access preamble format.6-7. (canceled)
 8. A method, comprising: receiving an internal structureof a random access slot configured by a base station through a broadcastchannel; determining the random access slot according to an associationbetween a downlink synchronization signal block and the random accessslot or a random access channel occasion; and transmitting a randomaccess signal on the determined random access slot.
 9. The method ofclaim 8, wherein the internal structure of the random access slotcomprises a number of symbols occupied by random access of an uplinkpart in the random access slot, and a number of random access channel(RACH) occasions for the uplink part in the random access slot. 10.(canceled)
 11. A device, comprising: a processor configured to: receivean internal structure of a random access slot configured by a basestation through a broadcast channel; determine the random access slotaccording to an association between a downlink synchronization signalblock and the random access slot or a random access channel occasion;and transmit a random access signal on the determined random accessslot.
 12. The device of claim 11, wherein the internal structure of therandom access slot comprises a number of symbols occupied by randomaccess of an uplink part in the random access slot, and a number ofrandom access channel (RACH) occasions for the uplink part in the randomaccess slot.
 13. (canceled)
 14. A non-transitory computer-readablestorage medium, which is configured to store computer-executableinstructions which, after executed, can implement a method comprising:configuring an internal structure of a random access slot through abroadcast channel, wherein the internal structure of the random accessslot comprises a number of symbols occupied by random access of anuplink part in the random access slot, and a number of random accesschannel (RACH) occasions for the uplink part in the random access slot;and transmitting, through the broadcast channel, the internal structureof the random access slot.
 15. The non-transitory computer-readablestorage medium of claim 14, wherein the internal structure of the randomaccess slot is configured according to a random access preamble format.16. A non-transitory computer-readable storage medium, which isconfigured to store computer-executable instructions which, afterexecuted, can implement a method comprising: receiving an internalstructure of a random access slot configured by a base station through abroadcast channel; determining the random access slot according to anassociation between a downlink synchronization signal block and therandom access slot or a random access channel occasion; and transmittinga random access signal on the determined random access slot.
 17. Thenon-transitory computer-readable storage medium of claim 16, wherein theinternal structure of the random access slot comprises a number ofsymbols occupied by random access of an uplink part in the random accessslot, and a number of random access channel (RACH) occasions for theuplink part in the random access slot.
 18. The non-transitorycomputer-readable storage medium of claim 16, wherein the associationbetween the downlink synchronization signal block and the random accessslot or the random access channel occasion is received via a systemmessage.
 19. The non-transitory computer-readable storage medium ofclaim 16, wherein the random access slot or the random access channeloccasion is related to an index of the downlink synchronization signalblock.
 20. The non-transitory computer-readable storage medium of claim16, wherein the association between the downlink synchronization signalblock and the random access slot or the random access channel occasionis the same as another association between another downlinksynchronization signal block and another random access slot or anotherrandom access channel occasion.
 21. The method of claim 8, wherein theassociation between the downlink synchronization signal block and therandom access slot or the random access channel occasion is received viaa system message.
 22. The method of claim 8, wherein the random accessslot or the random access channel occasion is related to an index of thedownlink synchronization signal block.
 23. The method of claim 8,wherein the association between the downlink synchronization signalblock and the random access slot or the random access channel occasionis the same as another association between another downlinksynchronization signal block and another random access slot or anotherrandom access channel occasion.
 24. The device of claim 11, wherein theassociation between the downlink synchronization signal block and therandom access slot or the random access channel occasion is received viaa system message.
 25. The device of claim 11, wherein the random accessslot or the random access channel occasion is related to an index of thedownlink synchronization signal block.
 26. The device of claim 11,wherein the association between the downlink synchronization signalblock and the random access slot or the random access channel occasionis the same as another association between another downlinksynchronization signal block and another random access slot or anotherrandom access channel occasion.